Metallic alloy



Pat ent ed Dec. 1, 1936 PATENT OFFICE METALLIC ALLOY Louis S. Deitz,Jr., Metuchen, N. J., and Hanley' H. WeisenPleasant Plains, N. Y.,assignors to Nassau Smelting and Refining Company, Incorporated, NewYork, N. Y., a. corporation of New York No Drawing. Application November5, 1935,

Serial No. 48,308

2 Claims.

This invention relates to a metallic alloy and more particularly to analloy of copper.

Bronze alloys comprising principally copper with admixtures of tin andsilicon are well known in the art as being generally characterized by acombination of high tensile strength and resistance to corrosion, beinggenerally particularly resistant to corrosive attack byacid agents.

An object of the present invention is to produce a silicon-tin bronzealloy having high duetility in addition to high tensile strength andresistance to acid corrosion.

One embodiment of the invention contemplates an alloy comprising from2.50% to 3.25% silicon,

0.50% to 1.25% tin, from 0.10% to 0.60% manganese, and the balancesubstantially all copper.

Other objects and characteristic features of the invention. will appearfrom the following detailed description of an embodiment thereof.

In one instance there was charged into a claygraphite crucible, set in apit furnace and fired with a mixture of coal and coke, the following,lbs. electrolytic grade copper, 12 oz. manganesecopper (24% Mn76% Cu),and suflicient granulated charcoal to cover the surface of the melt. Thetemperature was brought to between 2100 F.

and 2200 F. and held there long enough to melt the charge, to which wasthen added 15 lbs. silicon-copper (15 Si85% Cu) The temperature wasmaintained at 2100 F.-2200 F. until the added material was melted, andthe melt was stirred briefly with an iron rod.

The crucible was then lifted out and there was added 12 oz. tin whichwas stirred in briefly. Enough 'charcoal was then skimmed from thesurface to give cleanpouring and the charge was poured into an ironbillet mold.

This material when rolled into rod could be drawn cold withoutintermediate annealing from three eighths inch rod to No. 12 B 8: Sgauge wire, and in No. 8 B & S gauge wire showed 155,000 lbs. per sq.in. tensile strength, and in No. 12 B 8: S gaugewire showed 167,700 lbs.per sq. in.

It is found that manganese added to copper- 5 silicon-tin alloys inamounts from 0.01% to 0.60% appears tohave the definite effect ofincreasing to a remarkable extent both the cold workability and thetensile strength of such alloys. An alloy substantially like that abovedescribed with man- 10 ganese omitted showed, in one case, a tensilestrength of 145,000 lbs. per sq. in. when drawn into No. 8 B & S gaugewire, and required intermediate annealing to enable further drawing tobe done, which annealing would prevent the de- 15 velopment of hightensile strength.

The optimum manganese content is found to about 0.25% manganese inalloyscomprising also 2.50-3.25% silicon and 0.50-1.25% tin with the balancesubstantially all copper. 20

' The particular alloy disclosed above is merely one illustration of theinvention which is not limited to the specific proportions nor to themethod of preparing the alloy there disclosed. These may be departedfrom and altered in many ways with- 25 out departing from the spirit'andscope of the invention as pointed out in and limited only by theappended claims.

What is claimed is:

1. An alloy of copper having high tensile 30 strength and ductility andconsisting of copper, with 2.50% to 3.25% silicon, 0.50% to 1.25% tin,and 0.01% to 0.60% manganese.

2. An alloy 4 of copper having high tensile strength and ductility andconsisting of copper with about 2.75% silicon, about 1.00% tin, andabout 0.25% manganese. M

LOUIS S. DEITZ, JR.

\. HANLEY H. WEISER.

